Visible light driven g-C3N4/Bi4NbO8X (XCl, Br) heterojunction photocatalyst for the degradation of organic pollutants

•Sustainable layered heterojunction Z-Scheme CN/Bi4NbO8X (Cl, Br) photocatalyst.•Successful fabrication of layered heterojunction Z-Scheme CN/Bi4NbO8X (Cl, Br) by hydrothermal approach.•Efficient for the decomposition of RhB and Trypan Blue dye in less time.•Improved visible light photocatalytic act...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-02, Vol.895, p.162576, Article 162576
Main Authors: Sharma, Anjli, Kanth, Sanjeev Kumar, Xu, Shishi, Han, Ni, Zhu, Lei, Fan, Lele, Liu, Chao, Zhang, Qinfang
Format: Article
Language:English
Subjects:
Br) heterojunction
Carbon nitride
Charge efficiency
Current carriers
Electrochemical impedance spectroscopy
g-C3N4/Bi4NbO8X (Cl
Heterojunctions
Oxidation
Performance degradation
Photocatalysis
Photocatalysts
Photocatalytic degradation
Photoluminescence
Pollutants
Reaction mechanisms
Rhodamine
Sillén-Aurivillius
Visible light active photocatalyst
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Summary:•Sustainable layered heterojunction Z-Scheme CN/Bi4NbO8X (Cl, Br) photocatalyst.•Successful fabrication of layered heterojunction Z-Scheme CN/Bi4NbO8X (Cl, Br) by hydrothermal approach.•Efficient for the decomposition of RhB and Trypan Blue dye in less time.•Improved visible light photocatalytic activity of the synthesized compound. A highly potential visible light active g-C3N4/Bi4NbO8X (Cl, Br) heterojunction photocatalysts were constructed at the interface of the coupling between Bi4NbO8X (Cl, Br) and g-C3N4. The band gap value of heterojunctions g-C3N4/Bi4NbO8Br-20% (CNBNB-3), g-C3N4/Bi4NbO8Cl-20% (CNBNC-3), and pristine materials g-C3N4 (CN), Bi4NbO8Cl and Bi4NbO8Br were analyzed to be 2.68 eV, 2.69 eV and 2.74 eV, 2.46 eV and 2.48 eV, respectively. The degradation performance of optimized CNBNC-3 and CNBNB-3 photocatalysts revealed much superior removal efficiency of 97% and 84% than the pristine material for rhodamine B. The synthesized photocatalysts maintained good recyclable stability after five consecutive cycles and potentially capable of pollutant degradation. The electrochemical impedance and photoluminescence spectroscopy revealed that the migration and separation efficiency of photogenerated charge carriers of photocatalyst were boosted, while reduced recombination rate was observed. The photocatalytic reaction mechanism also revealed the superoxide ·O2− and •OH radicals are the main active species responsible for the pollutant degradation.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.162576